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- /* SPDX-License-Identifier: GPL-2.0-or-later */
- /*
- * INET An implementation of the TCP/IP protocol suite for the LINUX
- * operating system. INET is implemented using the BSD Socket
- * interface as the means of communication with the user level.
- *
- * Global definitions for the ARP (RFC 826) protocol.
- *
- * Version: @(#)if_arp.h 1.0.1 04/16/93
- *
- * Authors: Original taken from Berkeley UNIX 4.3, (c) UCB 1986-1988
- * Portions taken from the KA9Q/NOS (v2.00m PA0GRI) source.
- * Ross Biro
- * Fred N. van Kempen, <[email protected]>
- * Florian La Roche,
- * Jonathan Layes <[email protected]>
- * Arnaldo Carvalho de Melo <[email protected]> ARPHRD_HWX25
- */
- #ifndef _LINUX_IF_ARP_H
- #define _LINUX_IF_ARP_H
- #include <linux/skbuff.h>
- #include <uapi/linux/if_arp.h>
- static inline struct arphdr *arp_hdr(const struct sk_buff *skb)
- {
- return (struct arphdr *)skb_network_header(skb);
- }
- static inline unsigned int arp_hdr_len(const struct net_device *dev)
- {
- switch (dev->type) {
- #if IS_ENABLED(CONFIG_FIREWIRE_NET)
- case ARPHRD_IEEE1394:
- /* ARP header, device address and 2 IP addresses */
- return sizeof(struct arphdr) + dev->addr_len + sizeof(u32) * 2;
- #endif
- default:
- /* ARP header, plus 2 device addresses, plus 2 IP addresses. */
- return sizeof(struct arphdr) + (dev->addr_len + sizeof(u32)) * 2;
- }
- }
- static inline bool dev_is_mac_header_xmit(const struct net_device *dev)
- {
- switch (dev->type) {
- case ARPHRD_TUNNEL:
- case ARPHRD_TUNNEL6:
- case ARPHRD_SIT:
- case ARPHRD_IPGRE:
- case ARPHRD_IP6GRE:
- case ARPHRD_VOID:
- case ARPHRD_NONE:
- case ARPHRD_RAWIP:
- case ARPHRD_PIMREG:
- /* PPP adds its l2 header automatically in ppp_start_xmit().
- * This makes it look like an l3 device to __bpf_redirect() and tcf_mirred_init().
- */
- case ARPHRD_PPP:
- return false;
- default:
- return true;
- }
- }
- #endif /* _LINUX_IF_ARP_H */
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